package com.sky.service.impl;


import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.sql.rowset.BaseRowSet;
import java.time.LocalDateTime;
import java.util.List;

@Slf4j
@Service
public class ShoppingCartServiceImpl implements ShoppingCartService {
    @Autowired
    private ShoppingCartMapper shoppingCartMapper;

    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private SetmealMapper setmealMapper;

    @Override
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        //判断当前加入购物车中的商品是否已经存在了
        ShoppingCart shoppingCart =new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        Long userId= BaseContext.getCurrentId();
        shoppingCart.setUserId(userId);
        List<ShoppingCart> list=shoppingCartMapper.list(shoppingCart);
        //如果已经存在，只需要数量+1
        if (list!=null && list.size()>0){
            ShoppingCart cart = list.get(0);
            cart.setNumber(cart.getNumber()+1);
            shoppingCartMapper.update(cart);
        }
        //如果不存在，则需要插入一条购物车数据
        else{
          Long dishId=shoppingCartDTO.getDishId();
          if (dishId!=null){
              Dish dish = dishMapper.getById(dishId);
              shoppingCart.setName(dish.getName());
              shoppingCart.setImage(dish.getImage());
              shoppingCart.setAmount(dish.getPrice());
          }else{
              Long setmealId=shoppingCartDTO.getSetmealId();
              Setmeal setmeal= setmealMapper.getById(setmealId);
              shoppingCart.setName(setmeal.getName());
              shoppingCart.setImage(setmeal.getImage());
              shoppingCart.setAmount(setmeal.getPrice());
          }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);
        }
    }

    @Override
    public List<ShoppingCart> list() {
        Long userId=BaseContext.getCurrentId();
        ShoppingCart shoppingCart=new ShoppingCart();
        shoppingCart.setId(userId);
       return shoppingCartMapper.list(shoppingCart);
    }

    @Override
    public void delById() {
      Long  userId= BaseContext.getCurrentId();
      shoppingCartMapper.delById(userId);
    }

    @Override
    public void delSub(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart =new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        Long userId=BaseContext.getCurrentId();
        shoppingCart.setUserId(userId);
        //查询当前要删除商品的数量
      List<ShoppingCart> list=  shoppingCartMapper.list(shoppingCart);
        if (list == null || list.isEmpty()) {

            throw new RuntimeException("购物车中不存在该商品");
        }
        ShoppingCart cart = list.get(0);
        //大于1 数量-1
        if (cart.getNumber()>1){
            cart.setNumber(cart.getNumber()-1);
            shoppingCartMapper.update(cart);
        }else{
            shoppingCartMapper.delSub(shoppingCart);
        }
        //=1 直接删除

    }
}
